structure(list(MERCURY = c(1.6, 1.5, 1.7, 0.73, 0.56, 0.51, 0.48, 
0.95, 1.4, 0.5, 0.8, 0.34, 0.54, 0.69, 0.9, 0.48, 0.57, 0.41, 
0.61, 0.38, 0.61, 1.5, 0.72, 1.8, 1.6, 0.98, 0.88, 1.5, 0.73, 
1.2, 1.1, 1.6, 0.87, 0.9, 0.91, 0.61, 0.85, 0.99, 1.5, 0.7, 2.1, 
1.5, 1.5, 0.91, 1.8, 1.1, 1.3, 1.2, 1.6, 1.2, 1.2, 1.2, 0.28, 
0.51, 0.27, 0.35, 0.57, 0.66, 0.49, 0.51, 0.73, 0.94, 1.4, 2.7, 
1.8, 3.1, 0.5, 1.2, 0.55, 3.5, 2.7, 1.4, 0.73, 0.51, 0.23, 1.6, 
0.48, 0.58, 0.58, 0.5, 0.58, 1.4, 0.44, 0.55, 0.84, 0.65, 0.76, 
0.65, 0.5, 1.1, 1, 1.2, 0.53, 0.74, 0.41, 0.78, 1.3, 1.8, 1.4, 
0.75, 0.57, 0.69, 1.8, 0.93, 3.4, 2.4, 0.88, 1.5, 1.8, 1.5, 2.1, 
0.91, 0.61, 0.76, 0.86, 2.2, 2.9, 0.89, 0.5, 2.2, 2.4, 0.69, 
2.7, 0.9, 1.9, 0.65, 1.2, 0.83, 1.3, 1.3, 0.28, 0.21, 0.14, 0.39, 
0.39, 0.9, 0.64, 1.4, 0.58, 0.42, 0.11, 0.28, 0.59, 1.1, 1.6, 
1.3, 0.88, 1.8, 1.8, 1.2, 2.9, 3.4, 1.9, 2.4, 1.8, 2.4, 1.4, 
1.6, 1.7, 1.3, 0.93, 3.6, 3.5, 2.4, 2.9, 2.3, 1.4, 2.1, 1.7, 
1.4, 0.92), LENGTH = c(47, 48.7, 55.7, 45.2, 44.7, 43.8, 38.5, 
45.8, 44, 40.4, 47.7, 45.1, 43.5, 47.4, 41, 33.7, 33.5, 32.2, 
32, 29.5, 34.9, 47.1, 44.2, 41, 41.6, 39, 38, 36.1, 33.4, 32.8, 
31.4, 33.6, 29.5, 30.5, 27, 30, 30, 33.5, 31, 29, 65, 58, 36, 
36, 44, 40.5, 38.5, 40, 44.5, 50.5, 50, 47, 26, 30, 30, 29, 31, 
41, 36.5, 38, 44, 27.5, 39, 48, 51.5, 56, 30.5, 42, 34, 50.5, 
44.5, 30, 35, 30.4, 25.2, 36, 29.9, 34.7, 34.7, 31.7, 34.5, 40.1, 
30.7, 33, 40.5, 32, 37, 35.5, 30, 40, 35, 39.5, 31, 31.5, 30, 
33, 47, 54, 57.6, 46.2, 34.8, 34.5, 38.5, 40, 46.4, 41.9, 46.2, 
47.3, 47.1, 39, 56.5, 46.1, 28.5, 25.5, 40.2, 44.5, 36.5, 33.3, 
28.3, 46, 36.7, 39, 53, 43, 47.2, 36.5, 43.2, 41.5, 36, 36.2, 
27.3, 26.7, 27.5, 39, 33.9, 29.6, 46.5, 57.5, 49, 34.9, 29, 31.5, 
38.2, 28.6, 36.8, 43.4, 48.1, 50.8, 46.8, 40.2, 58.7, 56.1, 48, 
44.7, 43.6, 37.6, 40, 37.4, 46.5, 36, 50.4, 59.2, 58.4, 54, 53.7, 
49.5, 47.5, 54.2, 45.4, 41.7, 36), S = c(0, 0, 0, 0, 0, 0, 0, 
0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 
1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 
3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 6, 
6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 
8, 8, 8, 8, 8, 8, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 
11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 
12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 
14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15), N = 171), .Names = c("MERCURY", 
"LENGTH", "S", "N"))